rcpp_hdf5dataset_tcrossprod

Computes <code>A %*% t(B)</code> using the dedicated BigDataStatMeth
block-wise transposed cross-product algorithm. When A and B refer to the
same dataset, the symmetric optimisation is applied automatically.

internal

A framework for 'scalable' statistical computing on large on-disk
matrices stored in 'HDF5' files. It provides efficient block-wise
implementations of core linear-algebra operations (matrix multiplication,
SVD, PCA, and QR decomposition) written in C++ and R, along with building
blocks from which higher-level multivariate methods such as canonical
correlation analysis can be constructed. These building blocks are designed
not only for direct use, but also as foundational components for developing
new statistical methods that must operate on datasets too large to fit in
memory. The package supports data provided either as 'HDF5' files or
standard R objects, and is intended for high-dimensional applications such
as 'omics' and precision-medicine research.

Dolors Pelegri-Siso

BigDataStatMeth

Scalable Statistical Computing with HDF5-Backed Matrices

Juan R. Gonzalez

rcpp_hdf5dataset_tcrossprod function

<dl><dt>ptr_a</dt>
<dd>External pointer (SEXP) for matrix A</dd>
<dt>ptr_b</dt>
<dd>External pointer (SEXP) for matrix B</dd>
<dt>paral</dt>
<dd>Logical or NULL; enable OpenMP parallelisation</dd>
<dt>block_size</dt>
<dd>Integer or NULL; block size (NULL = auto)</dd>
<dt>threads</dt>
<dd>Integer or NULL; thread count when <code>paral = TRUE</code></dd>
<dt>outgroup</dt>
<dd>Character or NULL. Output group in the HDF5 file.
Default <code>"OUTPUT"</code>.</dd>
<dt>outdataset</dt>
<dd>Character or NULL. Output dataset name.
Default <code>"tCrossProd_A"</code> (single matrix) or
<code>"tCrossProd_A_x_B"</code> (two matrices).</dd></dl>

Arguments

Transposed cross product for HDF5 datasets (R6 wrapper) — rcpp_hdf5dataset_tcrossprod

<dl>

<dt>ptr_a</dt>
<dd>External pointer (SEXP) for matrix A</dd>


<dt>ptr_b</dt>
<dd>External pointer (SEXP) for matrix B</dd>


<dt>paral</dt>
<dd>Logical or NULL; enable OpenMP parallelisation</dd>


<dt>block_size</dt>
<dd>Integer or NULL; block size (NULL = auto)</dd>


<dt>threads</dt>
<dd>Integer or NULL; thread count when <code>paral = TRUE</code></dd>


<dt>outgroup</dt>
<dd>Character or NULL. Output group in the HDF5 file.
Default <code>"OUTPUT"</code>.</dd>


<dt>outdataset</dt>
<dd>Character or NULL. Output dataset name.
Default <code>"tCrossProd_A"</code> (single matrix) or
<code>"tCrossProd_A_x_B"</code> (two matrices).</dd>

</dl>

rcpp_hdf5dataset_tcrossprod: Transposed cross product for HDF5 datasets (R6 wrapper)

Description

Usage

Value

Arguments